Hologram duplication method

a duplication method and hologram technology, applied in the field of hologram duplication method, can solve the problems of difficult to reproduce the duplication of holograms recorded in disk-type recording media, difficult to produce reference beams for use upon duplication, and the inability of conventional emboss type duplication methods to duplicate volume-recorded data pages (holograms)

Inactive Publication Date: 2006-01-05
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] In the hologram duplication methods, for example, when a data page (master hologram) recorded in a holographic form on a disk type master recording medium is duplicated on a disk type duplication recording medium disposed in the proximity of the disk type mater recording medium, for example, N card type master recording media are prepared. Then, the data pages are individually recorded on the N disk type master recording media without being multiplexed by changing the angle of a reference light beam among the N disk type master recording media. Thereafter, the data page recorded on each of the disk type master recording media is recorded on the common disk type duplication recording medium so that the data pages are N-multiplex recorded finally on the disk type duplication recording medium. Thus, a large number of duplicates of a volume-recorded hologram, particularly

Problems solved by technology

However, a conventional emboss type duplication method of the surface roughness transfer type cannot duplicate a volume-recorded data page (hologram).
Further, in contact copying of a conventional type, since a parallel light beam is used, it is difficult to produce a reference beam for use upon duplication which has a same wavefront as that of a reference beam used upon production of a ma

Method used

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first embodiment

[0025] Referring first to FIG. 1, there is illustrated a general procedure of a hologram duplication method to which the present invention is applied. First, N master disks on which master holograms (data pages) are recorded in accordance with the angle multiplex method are produced (steps S1 and S2). In particular, as seen in FIG. 2A, data pages to be N-multiplexed originally are recorded, on a disk-type hologram material for each one data page, as interference fringes between a reference light beam 200 whose incoming angle varies and a signal light beam 100 spatially optically modulated by the data page. Consequently, N master disks D1 to Dn are produced. It is to be noted, however, that the incoming angle of the reference light beam 200 is varied within a plane defined by a disk normal line and a disk radial direction as seen in FIG. 3.

[0026] Then, copying of the master holograms recorded on the n master disks D1 to Dn to a single duplication hologram material 20 is performed (s...

second embodiment

[0040]FIG. 8 illustrates a general procedure of another hologram duplication method to which the present invention is applied and particularly illustrates a method of duplicating a hologram recording medium of the card type.

[0041] Referring to FIG. 8, N master disks of the angle multiplex type are produced (steps S11 and S12). In particular, as seen in FIG. 9A, data pages to be N-multiplexed originally are recorded, on a duplication hologram material 30 in the form of a card for each one data page, as interference fringes between a reference light beam 200 whose incoming angle varies and a signal light beam 100 spatially optically modulated by the data page. Consequently, N master cards C1 to Cn are produced.

[0042] Then, copying of recorded data of the N master cards C1 to Cn to one duplication hologram material 30 is performed (steps S13 and S14). More particularly, the reference light beam 200 in the form of parallel light beam is converted into an obliquely incoming beam 500 by...

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Abstract

A hologram duplication method is disclosed which makes it easy to duplicate a large number of holograms from a volume-recorded hologram, particularly from a hologram recorded in a recording medium of the disk type or the card type. N card type master recording media are prepared, and data pages are individually recorded on the N disk type master recording media without being multiplexed by changing the angle of a reference light beam among the N disk type master recording media. Thereafter, the data page recorded on each of the disk type master recording media is recorded on a common disk type duplication recording medium so that the data pages are N-multiplex recorded finally on the disk type duplication recording medium.

Description

BACKGROUND OF THE INVENTION [0001] This invention relates to a hologram duplication method for duplicating a hologram recording medium in which data pages are multiplex recorded in accordance with an angle multiplexing method. [0002] In recent years, a holographic technique has been developed rapidly in order to place a holographic memory into practical use, which attracts attention as a very promising candidate for a storage which is competitive with optical disks of the next generation and the next next generation. A hologram recording and reproduction system which makes use of a hologram technique to record and reproduce a large amount of data has been proposed and is disclosed, for example, in “Holographic data storage”, IBM J. RES DEVELOP, Vol. 44, No. 3, May 2000. [0003] Such a hologram recording and reproduction system as described above uses a method called multiplex recording in order to achieve high density recording. The multiplexing recording records a large number of in...

Claims

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Application Information

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IPC IPC(8): G11B7/00
CPCG03H1/02G03H1/202G03H1/26G03H1/265G11B7/28G03H2223/24G11B7/0065G11B7/26G03H2001/0216G03H1/0465
Inventor KIHARA, NOBUHIROKANESAKA, TOMOKI
Owner SONY CORP
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